scholarly journals Direct genotyping of single pollen grains of a self-compatible mutant of Japanese pear (Pyrus pyrifolia) revealed inheritance of a duplicated chromosomal segment containing a second S-haplotype

Euphytica ◽  
2014 ◽  
Vol 200 (2) ◽  
pp. 297-304 ◽  
Author(s):  
Nobuko Mase ◽  
Yutaka Sawamura ◽  
Toshiya Yamamoto ◽  
Norio Takada ◽  
Sogo Nishio ◽  
...  
Keyword(s):  
Pollen Grains ◽  
Chromosomal Segment ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
S Haplotype

scholarly journals Addition of Forchlorfenuron to Spray Pollination Media Increases Fruit Set in ‘Hosui’ Japanese Pear

2016 ◽  
Vol 26 (2) ◽  
pp. 185-190
Author(s):  
Daisuke Sakamoto ◽  
Shinnosuke Kusaba ◽  
Yuri Nakamura
Keyword(s):  
Fruit Set ◽  
Germination Rate ◽  
Pollen Grains ◽  
Fruit Production ◽  
Fruit Shape ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
High Germination ◽  
Hand Pollination ◽  
Acceptable Method

The effects on fruit set of adding forchlorfenuron (CPPU) to media in which pollen grains were suspended and used for spray pollination was investigated in ‘Hosui’ japanese pear (Pyrus pyrifolia). The percentages of fruit set after spray pollination were lower than those after hand pollination; however, media with 2 or 10 mg·L−1 CPPU used for spray pollination resulted in greater percentages of fruit set than media without CPPU. The media with CPPU also resulted in higher levels of pollen germination compared with the medium without CPPU; however, the number of seeds per fruit with CPPU treatment tended to be almost the same or less than for fruit without CPPU treatment. From these results, the higher levels of fruit set by CPPU might not be due to the high germination rate of the pollen grains but due to the induction of partial parthenocarpic properties. The medium with 10 mg·L−1 CPPU gave the highest levels of fruit set, but the fruit had abnormally thickened and enlarged calyxes, and the fruit shape tended to be deformed at ≈21 days after flowering. In addition, all of the harvested fruit were calyx-perpetual fruit in which the calyx remains until harvest time. Fruit treated with 2 mg·L−1 CPPU also yielded calyx-perpetual fruit with high frequency, but the fruit had normal calyxes and the fruit shape tended to be more normal. Thus, we conducted experiments focusing on the medium containing 2 mg·L−1 CPPU. Although the results were variable from year to year, more than 70% of hand-pollinated flowers set fruit during the 3-year study; this level of fruit production is sufficient for practical use. Thus, spray pollination using a medium with 2 mg·L−1 CPPU is an acceptable method for pollinating ‘Hosui’ japanese pear.

scholarly journals A segmental duplication encompassing S-haplotype triggers pollen-part self-compatibility in Japanese pear (Pyrus pyrifolia)

2013 ◽  
Vol 33 (1) ◽  
pp. 117-128 ◽  
Author(s):  
Nobuko Mase ◽  
Yutaka Sawamura ◽  
Toshiya Yamamoto ◽  
Norio Takada ◽  
Sogo Nishio ◽  
...  
Keyword(s):  
Segmental Duplication ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
S Haplotype ◽  
Self Compatibility

scholarly journals Cloning of the S8-RNase (S8-allele) of Japanese Pear (Pyrus pyrifolia Nakai).

2002 ◽  
Vol 19 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Carlos CASTILLO ◽  
Takeshi TAKASAKI ◽  
Toshihiro SAITO ◽  
Shigemi NORIOKA ◽  
Tetsu NAKANISHI
Keyword(s):  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Pyrus Pyrifolia Nakai

Botryosphaeria berengeriana f.sp. piricola. [Distribution map].

1996 ◽  
Author(s):  
Keyword(s):  
Geographical Distribution ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Malus Pumila ◽  
Distribution Map ◽  
European Pear ◽  
New Distribution

Abstract A new distribution map is provided for Botryosphaeria berengeriana f.sp. piricola (Nose) Koganezawa & Sakuma. Hosts: Japanese pear (Pyrus pyrifolia), also European pear (P. communis) and apple (Malus pumila). Information is given on the geographical distribution in China, Anhui, Fujian, Guangxi, Hebei, Henan, Hubei, Jiangsu, Jiangxi, Jilin, Liaoning, Shandong, Shanxi, Sichuan, Zhejiang, Japan, Honshu, Shikoku, Korea Dem. People's Republic, Korea Republic, Taiwan.

Pathogenic Specialization of Venturia nashicola, Causal Agent of Asian Pear Scab, and Resistance of Pear Cultivars Kinchaku and Xiangli

2020 ◽  
Author(s):  
Hideo Ishii ◽  
Kumiko Nishimura ◽  
Kenji Tanabe ◽  
Yuichi Yamaoka
Keyword(s):  
Resistance Breeding ◽  
Scab Resistance ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Asian Pear ◽  
Sexual Recombination ◽  
Venturia Nashicola ◽  
Race 1 ◽  
New Races ◽  
Race 2

Scab, caused by Venturia nashicola is one of the most serious diseases of Asian pears including Japanese pear (Pyrus pyrifolia var. culta) and Chinese pears (P. bretschneideri and P. ussuriensis). Breeding of scab-resistant pear cultivars is essential to minimize the use of fungicides and the risk of fungicide resistance developing in the pathogen. A survey of pathogenic specialization in V. nashicola is needed to ensure durable scab resistance in cultivated pears. Race 1, 2, and 3 isolates of V. nashicola, each differing in pathogenicity to Japanese pear cv. Kousui and Asian pear strain Mamenashi 12, have been reported from Japan. In the present study, isolates collected from scabbed pears in China and Taiwan were classified as V. nashicola based on conidial size and mating ability. However, various isolates were found to have pathogenicity distinct from races 1, 2, and 3 in tests on seven differential host genotypes: Kousui; Mamenashi 12; Chinese pear cvs. Jingbaili, Yali, Linyuli, Nanguoli; and Taiwanese pear cv. Hengshanli. The new races were designated as races 4 to 7. Progenies characteristic of race 3 isolates were produced in a cross between race 1 and race 2 isolates, suggesting the possible role of sexual recombination in the emergence of novel races. Japanese pear cv. Kinchaku and cv. Xiangli of P. sinkiangensis (Korla fragrant pear grown in China) didn’t show visible symptoms after inoculation with any of the seven races. The broad scab resistance in Kinchaku and Xiangli makes them a promising genetic resource for resistance breeding programs.

scholarly journals Effect of Hydrogen Peroxide on Breaking Endodormancy in Flower Buds of Japanese Pear (Pyrus pyrifolia Nakai)

2005 ◽  
Vol 74 (3) ◽  
pp. 255-257 ◽  
Author(s):  
Haruyuki Kuroda ◽  
Toshihiko Sugiura ◽  
Hiroyoshi Sugiura
Keyword(s):  
Hydrogen Peroxide ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Flower Buds ◽  
Pyrus Pyrifolia Nakai
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